Is Kate Upton the sexiest Carl's Jr. burger goddess?

The next buxom beauty to bite into a sloppy Carlâs Jr. burger is Kate Upton -- a 19-year-old supermodel already being dubbed the "sexiest" celeb to appear in one of the chain'sÂ provocativeÂ fast-food ads.

Upton, named Rookie of the Year in the 2011 Sports Illustrated Swimsuit issue, recently finished shooting a Southwest Patty Melt commercial for Carl's Jr. and sister chain, Hardee's.Â The sex-infused ad will air later this month when the spicy sandwich debuts at both chains, company spokeswoman Beth Mansfield said.

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